class mun
{
public:
    mun()
    {
        _mun += _i;
        _i++;
    }
    static int GetMun()//全局函数
    {
        return _mun;
    }
private:
    static int _i;//声明
    static int _mun;//全局变量
};
int mun::_i = 1;//定义
int mun::_mun = 0;
class Solution {
public:
    int Sum_Solution(int n) {
        //mun::Init();
        mun*p = new mun[n];
       // mun a[n];
        return mun::GetMun();
    }
};